Added the ability to adjust the AEC3 performance for large rooms

webrtc/modules/audio_processing/aec3/echo_canceller3.cc

Index: webrtc/modules/audio_processing/aec3/echo_canceller3.cc
diff --git a/webrtc/modules/audio_processing/aec3/echo_canceller3.cc b/webrtc/modules/audio_processing/aec3/echo_canceller3.cc
index 4cd9c39729c2b3d2ae65660fabc0be0f8eff4849..b213205d68d1aaae614734408bea028e32683c89 100644
--- a/webrtc/modules/audio_processing/aec3/echo_canceller3.cc
+++ b/webrtc/modules/audio_processing/aec3/echo_canceller3.cc
@@ -200,14 +200,20 @@ void EchoCanceller3::RenderWriter::Insert(AudioBuffer* input) {
 
 int EchoCanceller3::instance_count_ = 0;
 
-EchoCanceller3::EchoCanceller3(int sample_rate_hz, bool use_highpass_filter)
-    : EchoCanceller3(sample_rate_hz,
+EchoCanceller3::EchoCanceller3(
+    const AudioProcessing::Config::EchoCanceller3& config,
+    int sample_rate_hz,
+    bool use_highpass_filter)
+    : EchoCanceller3(config,
+                     sample_rate_hz,
                      use_highpass_filter,
                      std::unique_ptr<BlockProcessor>(
-                         BlockProcessor::Create(sample_rate_hz))) {}
-EchoCanceller3::EchoCanceller3(int sample_rate_hz,
-                               bool use_highpass_filter,
-                               std::unique_ptr<BlockProcessor> block_processor)
+                         BlockProcessor::Create(config, sample_rate_hz))) {}
+EchoCanceller3::EchoCanceller3(
+    const AudioProcessing::Config::EchoCanceller3& config,

[ivoc, 2017/06/30 11:40:03]

This argument is also not used, Is it needed?

[peah-webrtc, 2017/06/30 13:20:16]

No, you are totally right. Good point and find!

Done.

+    int sample_rate_hz,
+    bool use_highpass_filter,
+    std::unique_ptr<BlockProcessor> block_processor)
     : data_dumper_(
           new ApmDataDumper(rtc::AtomicOps::Increment(&instance_count_))),
       sample_rate_hz_(sample_rate_hz),
@@ -331,7 +337,7 @@ std::string EchoCanceller3::ToString(
 
 bool EchoCanceller3::Validate(
     const AudioProcessing::Config::EchoCanceller3& config) {
-  return true;
+  return (config.echo_decay >= 0.f && config.echo_decay < 1.f);
 }
 
 void EchoCanceller3::EmptyRenderQueue() {